Liquid filter assembly and methods

ABSTRACT

A liquid filter assembly includes a porous tubular support member and a filter element removably and replaceably oriented in the interior volume of the support member. A bypass valve arrangement is provided to permit at least some unfiltered liquid to bypass media in the filter element. A dynamic seal can help to seal the bypass valve arrangement.

This application is being filed on, 30 Sep. 2015 as a US National Stageapplication of PCT International Patent application No.PCT/US2014/032700, filed 2 Apr. 2014 which claims priority to U.S.Provisional patent application Ser. No. 61/808,077, filed Apr. 3, 2013,and U.S. Provisional patent application Ser. No. 61/909,619, filed Nov.27, 2013 which applications are incorporated herein by reference. To theextent appropriate, a claim of priority is made to each of the abovedisclosed applications.

This disclosure concerns filter assemblies, components, e.g. filterelements, and methods for filtration of liquid, such as oil, includinghydraulic oil.

In-tank filter systems include filter assemblies configured to bemounted on a reservoir tank for the liquid involved. The assemblytypically provide for at least one of liquid flow to the tank, or adrawing of liquid from the tank. Some of the filter assemblies used inthese systems are complex.

Object of the present invention is to provide improved filterassemblies, filter elements and filtering methods, in particular bysolving the issues of complexity of the prior art systems.

This object is solved by the independent claims.

In the following, preferred embodiments of the present invention aredescribed. In one preferred embodiment, a liquid filter assembly isprovided. The assembly can include a housing arrangement including asurrounding wall defining a housing interior, an inlet, and an outlet; aporous tubular support member operably oriented in the housing interior;the support member having an interior volume; and a filter elementremovably and replaceably oriented in the interior volume of the supportmember.

In another preferred embodiment, the filter element can include atubular media pack defining a media interior; the media pack can besecured to a closed end cap and an open end cap; the filter elementbeing arranged relative to the housing arrangement to receive unfilteredliquid from the housing inlet, into the media interior and then allowthe unfiltered liquid to flow through the media pack and then throughthe support member to a filtered liquid volume outside of the interiorvolume of the support member, and then through the housing outlet.

In another preferred embodiment, a bypass valve arrangement can beprovided. The bypass valve arrangement can be constructed and arrangedto permit at least some unfiltered liquid to bypass the media pack andflow into the filtered liquid volume outside of the support member; thebypass valve arrangement can include a valve head and a valve seat; whenthe valve head is moved out of sealing engagement with the valve seat, abypass opening allows flow of unfiltered liquid into the filtered liquidvolume, when the valve head in in sealing engagement with the valveseat, the bypass opening is closed, preventing unfiltered liquid frombypassing the media pack.

In another preferred embodiment, a dynamic seal can be provided. Thedynamic seal is engaged as the valve head moves into and out of sealingengagement.

In another preferred embodiment, the bypass valve arrangement caninclude a bias member seat attached to the support member; and a biasingmember operably held by the bias member seat. The valve head can bewithin the bias member seat and engaged against the biasing member; andthe valve seat can be secured to the housing arrangement and being inremovable sealing engagement with the valve head.

In another preferred embodiment, the dynamic seal can include a sealmember held by the filter element.

In another preferred embodiment, the seal member may comprise an o-ringseal member held by the open end cap and dynamically sealed against asealing surface of the valve head.

In another preferred embodiment, the dynamic seal may include a sealmember held by the valve head.

In another preferred embodiment, the bias member seat can include anouter tube and an inner tube; the outer tube surrounding and beingradially spaced from at least a portion of the valve head.

In another preferred embodiment, the biasing member may be orientedbetween an inside of the outer tube of the bias member seat and anoutside of the valve head.

In another preferred embodiment, the valve head can include a steppedring; an inside surface of the stepped ring holding the dynamic seal andforming the dynamic sealing engagement with the inner tube of the biasmember seat.

In another preferred embodiment, the media pack can extend between theclosed end cap and open end cap.

In another preferred embodiment, the housing arrangement can include aremovable cover to provide access to the housing interior.

In another preferred embodiment, the biasing member can comprise a wavespring.

In another preferred embodiment, the closed end cap may include anexterior portion and an opposite interior portion; the interior portionbeing in communication with the media interior; the exterior portion ofthe closed end cap having a bulge that extends away from a remainingportion of the filter element and beyond the second end of the mediapack.

In another preferred embodiment, the support member can be rigid.

-   -   In another preferred embodiment a liquid filter assembly can        include a housing arrangement including a surrounding wall        defining a housing interior, an inlet, and an outlet.

In another preferred embodiment, a porous tubular support member can beoperably oriented in the housing interior, and the support member willhave an interior volume.

In another preferred embodiment, a filter element can be removably andreplaceably oriented in the interior volume of the support member. Thefilter element may include a tubular media pack defining a mediainterior, the media pack being secured to a closed end cap and an openend cap. The filter element can include a seal member. The filterelement can be arranged relative to the housing arrangement to receiveunfiltered liquid from the housing inlet, into the media interior, andthen allow the unfiltered liquid to flow through the media pack and thenthrough the support member to a filtered liquid volume outside of theinterior volume of the support member, and then through the housingoutlet.

In another preferred embodiment, the bypass valve arrangement can beconstructed and arranged to permit at least some unfiltered liquid tobypass the media pack and flow into the filtered liquid volume outsideof the support member. The bypass valve arrangement can include a biasmember seat attached to the support member; a biasing member operablyheld by the bias member seat; a valve head within the bias member seatand engaged against the biasing member; and a valve seat secured to thehousing arrangement and in removable sealing engagement with the valvehead such that when the valve head is moved out of sealing engagementwith the valve seat, its bypass opening allows flow of unfiltered liquidinto the filtered liquid volume, and when the valve head is in sealingengagement with the valve seat, the bypass opening is closed, preventingunfiltered liquid from bypassing the media pack.

In another preferred embodiment, the valve head can have a sealingsurface. The filter element seal member can be sealed against thesealing surface.

In another preferred embodiment a liquid filter assembly can alsoinclude a filter member that includes a seal member forming a sealagainst the support member.

In another preferred embodiment, the bypass valve arrangement caninclude a bias member seat attached to the housing arrangement; abiasing member operably held by the bias member seat; a valve headwithin the bias member seat and engaged against the biasing member; anda valve seat secured to the support member and being in removablesealing engagement with the valve head such that when the valve head ismoved out of sealing engagement with the valve seat, its bypass openingallows flow of unfiltered liquid into the filter liquid volume, and whenthe valve head is in sealing engagement with the valve seat, the bypassopening is closed, preventing unfiltered liquid from bypassing the mediapack.

In another preferred embodiment, the media pack can extend between theclosed end cap and the open end cap.

In another preferred embodiment, the filter element seal member maycomprise an O-ring seal member held by the open end cap.

In another preferred embodiment, a bypass valve seal member can beoperably held by the valve seat.

In another preferred embodiment, the valve head can include a steppedring.

In another preferred embodiment, the valve head can include a steppedring having an axial end. The axial end can be in sealing engagementagainst the bypass seal member when the bypass opening is closed. Theaxial end can be spaced away from the bypass seal member when the bypassopening is opened.

In another preferred embodiment, the housing arrangement can include aremovable cover to provide access to the housing interior.

In another preferred embodiment, the bias member seat may comprise atube surrounding and being radially spaced from at least a portion ofthe filter element and the valve head.

In another preferred embodiment, the biasing member can be orientedbetween an inside of the tube of the bias member seat at an outside ofthe valve head.

In another preferred embodiment, the valve head can comprise a steppedring, with an inside surface of the stepped ring forming the sealingsurface.

In another preferred embodiment, the filter element seal member cancomprise an O-ring seal member held by the open end cap and sealedagainst the valve head sealing surface.

In another preferred embodiment, the biasing member can be engagedagainst the step in the stepped ring.

In another preferred embodiment, the stepped ring can have an axial end.The axial end can be in sealing engagement against the valve seat whenthe bypass opening is closed. The axial end can be spaced away from thevalve seat when the bypass opening is opened.

In another preferred embodiment, a bypass valve seal member can beoperably held by the valve seat. The axial end of the stepped ring canmove into and out of engagement with the bypass valve seal member toclose and open the bypass opening.

In another preferred embodiment, the housing surrounding wall can havean inwardly extending shelf.

In another preferred embodiment, the valve seat can be secured to thehousing at the inwardly extending shelf.

In another preferred embodiment, the bias member seat can comprise anouter tube and an inner tube. The outer tube can surround and beradially spaced from at least a portion of the valve head.

In another preferred embodiment, the biasing member can be orientedbetween an inside of the outer tube of the bias member seat and anoutside of the valve head.

In another preferred embodiment, the valve head can comprise a steppedring. An inside surface of the stepped ring can be in sealing engagementwith the inner tube of the bias member seat.

In another preferred embodiment, the biasing member can be engagedagainst the step in the ring.

In another preferred embodiment, the valve seat can include a bandsurrounding at least a portion of the support tube.

In another preferred embodiment, the housing surrounding wall can havean inwardly extending shelf, and the bias member seat can be secured tothe housing at the shelf.

In another preferred embodiment, the media pack can have an outsidediameter which is less than an outside diameter of an o-ring seal memberon the element.

In another preferred embodiment, the media pack can have an outsidediameter which is greater than an inside diameter of the o-ring sealmember on the element.

In another preferred embodiment, the media pack can have an outsidediameter which is less than an outside diameter of an o-ring seal memberon the element and greater than an inside diameter of the o-ring sealmember on the element.

In another preferred embodiment a method of filtering can includeproviding a housing arrangement including a surrounding wall defining ahousing interior, an inlet, and an outlet. A rigid porous tubularsupport member can be operably oriented in the housing interior. Thesupport member can have an interior volume. A filter element can beremovably and replaceably oriented in the interior volume of the supportmember. The filter element can include a tubular media pack defining amedia interior. The media pack can be secured to a closed end cap and anopen end cap. The filter element can include a seal member.

In another preferred embodiment, the method can include directingunfiltered liquid to flow into the housing inlet, and into the mediainterior.

In another preferred embodiment, the method can include filtering theunfiltered liquid by directing the liquid to flow through the media packand then through the support member to a filtered liquid volume outsideof the interior volume of the support member, and then through thehousing outlet.

In another preferred embodiment, the method can include opening a bypassvalve arrangement when restriction across the media pack reaches apredetermined level. The step of opening the bypass valve arrangementwill permit at least some unfiltered liquid to bypass the media pack andflow into the filtered liquid volume outside of the support member.

In another preferred embodiment, the bypass valve arrangement, in themethod, can include a bias member seat; a biasing member operably heldby the bias member seat; a valve head within the bias member seat andengaged against the biasing member; and a valve seat in removablesealing engagement with the valve head, such that when restrictionacross the media pack reaches a predetermined level, the valve head ismoved out of sealing engagement with the valve seat, opening a bypassopening to allow flow of unfiltered liquid into the filtered liquidvolume.

In another preferred embodiment, in the method, the bias member seat canbe attached to the support member.

In another preferred embodiment, in the method, the bias member seat canbe attached to the housing arrangement.

In another preferred embodiment, in the method, the valve head can havea sealing surface, and the filter element seal member can be sealedagainst the sealing surface.

In another preferred embodiment, in the method, the filter element caninclude a seal member that forms a seal against the support member.

In another preferred embodiment, in the method, the valve seat can besecured to the housing arrangement.

In another preferred embodiment, in the method, the valve seat can besecured to the support member.

In another preferred embodiment a filter element is provided comprisinga tubular media pack defining a media interior and having opposite firstand second ends; an open end cap secured to the media pack at the secondend; a closed end cap secured to the media pack at the second end; and aseal member supported by the open end cap, the seal member configured todynamically seal against a portion of an assembly, when the filterelement is operably installed with the assembly.

In another preferred embodiment, the seal member may comprise an o-ringseal member.

In another preferred embodiment, the media pack has an outside diameterwhich can be less than an outside diameter of the o-ring seal member.

In another preferred embodiment, the media pack has an outside diameterwhich can be greater than an inside diameter of the o-ring seal member.

In another preferred embodiment, the closed end cap can include anexterior portion and an opposite interior portion; the interior portionbeing in communication with the media interior; the exterior portion ofthe closed end cap may have a bulge that extends away from a remainingportion of the filter element and beyond the second end of the mediapack.

In another preferred embodiment, the interior portion of the closed endcap can define a concave receptacle.

In another preferred embodiment, a liquid filter assembly comprises:

-   -   (a) a head arrangement including an inlet;    -   (b) a porous tubular support member directly or indirectly        supported by the head arrangement; the support member having an        interior volume;    -   (c) a filter element removably and replaceably oriented in the        interior volume of the support member; the filter element        including a tubular media pack defining a media interior; the        media pack being secured to a closed end cap and an open end        cap; the filter element including a seal member;        -   (i) the filter element being arranged relative to the head            arrangement to receive unfiltered liquid from the head            inlet, into the media interior and then allow the liquid to            flow through the media pack and then through the support            member to a filtered liquid volume outside of the interior            volume of the support member;    -   (d) a bypass valve arrangement constructed and arranged to        permit, in response to pressure within the media interior        exceeding a predetermined threshold, at least some unfiltered        liquid to bypass the media pack and flow into the filtered        liquid volume outside of the support member; the bypass valve        arrangement including:        -   (i) a bias member seat disposed between the inlet and the            filter element;        -   (ii) a biasing member directly or indirectly supported by            the bias member seat;        -   (iii) a valve head engaged against the biasing member;            -   (A) the valve head having a sealing surface; the filter                element seal member being sealed against the sealing                surface; and        -   (iv) a valve seat secured to the head arrangement and being            in removable sealing engagement with the valve head, such            that:            -   (A) when the valve head is moved out of sealing                engagement with the valve seat, a bypass opening allows                flow of unfiltered liquid into the filtered liquid                volume, and            -   (B) when the valve head in in sealing engagement with                the valve seat, the bypass opening is closed, preventing                unfiltered liquid from bypassing the media pack.

In another preferred embodiment, a liquid filter assembly comprises:

-   -   (a) a head arrangement including an inlet;    -   (b) a porous tubular support member directly or indirectly        supported by the head arrangement; the support member having an        interior volume;    -   (c) a filter element removably and replaceably oriented in the        interior volume of the support member; the filter element        including a tubular media pack defining a media interior; the        media pack being secured to a closed end cap and an open end        cap;        -   (i) the filter element including a seal member forming a            seal against the support member;        -   (ii) the filter element being arranged relative to the head            arrangement to receive unfiltered liquid from the head            inlet, into the media interior and then allow the liquid to            flow through the media pack and then through the support            member to a filtered liquid volume outside of the interior            volume of the support member;    -   (d) a bypass valve arrangement constructed and arranged to        permit, in response to pressure within the media interior        exceeding a predetermined threshold, at least some unfiltered        liquid to bypass the media pack and flow into the filtered        liquid volume outside of the support member; the bypass valve        arrangement including:        -   (i) a bias member seat disposed between the inlet and the            filter element;        -   (ii) a biasing member directly or indirectly supported by            the bias member seat;        -   (iii) a valve head engaged against the biasing member; and        -   (iv) a valve seat secured to the support member and being in            removable sealing engagement with the valve head, such that:            -   (A) when the valve head is moved out of sealing                engagement with the valve seat, a bypass opening allows                flow of unfiltered liquid into the filtered liquid                volume, and            -   (B) when the valve head in in sealing engagement with                the valve seat, the bypass opening is closed, preventing                unfiltered liquid from bypassing the media pack.

In another preferred embodiment, the media pack extends between theclosed end cap and open end cap.

In another preferred embodiment, the filter element seal membercomprises an o-ring seal member held by the open end cap.

In another preferred embodiment, a bypass valve seal member operablyheld by the valve seat.

In another preferred embodiment, the valve head includes a stepped ring.

In another preferred embodiment, the valve head includes a stepped ringhaving an axial end; the axial end being in sealing engagement againstthe bypass seal member when the bypass opening is closed; the axial endbeing spaced away from the bypass seal member when the bypass opening isopened.

In another preferred embodiment, the head arrangement includes aremovable cover.

In another preferred embodiment, the bias member seat comprises a tubesurrounding and being radially spaced from at least a portion of thefilter element and the valve head.

In another preferred embodiment, the biasing member is oriented betweenan inside of the tube of the bias member seat and an outside of thevalve head.

In another preferred embodiment, the valve head comprises a steppedring; an inside surface of the stepped ring forming the sealing surface.

In another preferred embodiment, the filter element seal membercomprises an o-ring seal member held by the open end cap and sealedagainst the valve head sealing surface.

In another preferred embodiment, the biasing member is engaged againstthe step in the ring.

In another preferred embodiment, the stepped ring has an axial end; theaxial end being in sealing engagement against the valve seat when thebypass opening is closed; the axial end being spaced away from the valveseat when the bypass opening is opened.

In another preferred embodiment, a bypass valve seal member operablyheld by the valve seat; and wherein the axial end of the stepped ringmoves into and out of engagement with the bypass valve seal member toclose and open the bypass opening.

In another preferred embodiment, the bias member seat comprises an outertube and an inner tube; the outer tube surrounding and being radiallyspaced from at least a portion of the valve head.

In another preferred embodiment, the biasing member is oriented betweenan inside of the outer tube of the bias member seat and an outside ofthe valve head.

In another preferred embodiment, the valve head comprises a steppedring; an inside surface of the stepped ring forming sealing engagementwith the inner tube of the bias member seat.

In another preferred embodiment, the biasing member is engaged againstthe step in the ring.

In another preferred embodiment, the stepped ring has an axial end; theaxial end being in sealing engagement against the valve seat when thebypass opening is closed; the axial end being spaced away from the valveseat when the bypass opening is opened.

In another preferred embodiment, a bypass valve seal member operablyheld by the valve seat; and wherein the axial end of the stepped ringmoves into and out of engagement with the bypass valve seal member toclose and open the bypass opening.

In another preferred embodiment, the valve seat includes a bandsurrounding at least a portion of the support member.

In another preferred embodiment, the biasing member comprises a wavespring.

In another preferred embodiment, the closed end cap includes an exteriorportion and an opposite interior portion; the interior portion being incommunication with the media interior; the exterior portion of theclosed end cap having a bulge that extends away from a remaining portionof the filter element and beyond the second end of the media pack.

A variety of examples of desirable product features or methods are setforth in part in the description that follows, and in part will beapparent from the description, or may be learned by practicing variousaspects of this disclosure. The aspects of the disclosure may relate toindividual features as well as combinations of features. It is to beunderstood that both the forgoing general description and the followingdetailed description are explanatory only, and are not restrictive ofthe claimed invention.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a cross-sectional view of a portion of a liquid filterassembly having a filter element operably installed therein, constructedin accordance with principles of this disclosure;

FIG. 2 is an exploded perspective view of a portion of the filterassembly of FIG. 1;

FIG. 3 is an enlarged cross-sectional view of a portion of the filterassembly of FIG. 1, and depicting the bypass valve in a closed position;

FIG. 4 is a view similar to FIG. 3, but showing the bypass valve in anopen position;

FIG. 5 is a cross-sectional view of a portion of a filter assembly,constructed in accordance with principles of this disclosure;

FIG. 6 is an exploded, perspective view of a portion of the filterassembly of FIG. 5;

FIG. 7 is an enlarged, cross-sectional view of a portion of the filterassembly of FIG. 5, and showing the bypass valve in a closed position;

FIG. 8 is a view similar to FIG. 7 and showing the bypass valve in anopen position;

FIG. 9 is a schematic perspective exploded view of the liquid filterassembly of FIG. 1 in a tank, a portion of the tank being removed sothat the interior is visible;

FIG. 10 is a schematic perspective exploded view of the liquid filterassembly of FIG. 9, from a view outside of the tank;

FIG. 11 is another schematic perspective exploded view of the liquidfilter assembly of FIGS. 9 and 10, a portion of the tank being removedso that the interior is visible;

FIG. 12 is a cross-sectional view of a portion of a module assembly,including a support tube and filter element, used in the assembly ofFIGS. 1-4;

FIG. 13 is a cross-sectional view of a portion of a module assembly,including a support tube and filter element, used in the assembly ofFIGS. 5-8;

FIG. 14 is a schematic exploded perspective view of a portion of thefilter assembly of FIGS. 1-4 and including additional optionalcomponents;

FIG. 15 is a perspective view of a portion of a bottom end of a supporttube useable with embodiments herein:

FIG. 16 is a schematic, cross-sectional view of the bottom end of thesupport tube of FIG. 15 and depicting the end of the filter elementassembled therein;

FIG. 17 is a partial cross-sectional view of another embodiment of afilter assembly, the cross-section being taken along the line 17-17 ofFIG. 20;

FIG. 18 is an enlarged view of section A-A of FIG. 17;

FIG. 19 is an enlarged view of section B-B of FIG. 17;

FIG. 20 is an end view of FIG. 17;

FIG. 21 is a cross-sectional view of the filter element in the filterassembly of FIG. 17, the cross-section being taken along the line 21-21of FIG. 22;

FIG. 22 is an end view of the filter element of FIG. 21;

FIG. 23 is a perspective, cross-sectional view of a portion of a liquidfilter assembly, constructed in accordance with the principles of thisdisclosure;

FIG. 24 is a perspective view of a biasing member utilized in theassembly of FIG. 23;

FIG. 25 is a perspective view of a replaceable filter element utilizedin the assembly of FIG. 23;

FIG. 26 is a cross-sectional view of a portion of the filter element andsupport tube of FIG. 23; and

FIG. 27 is a perspective, cross-sectional view of a portion of thesupport tube utilized in the assembly of FIG. 23.

DETAILED DESCRIPTION

Described are example embodiments of components that can be useful inliquid filter assemblies to improve the prior art. Where appropriate,like parts will have the same reference numerals.

In FIGS. 1 and 5, a liquid filter assembly is shown generally at 10. Theliquid filter assembly 10 is useful for filtering fluids, such as oil,including hydraulic oil. The filter assembly 10 can be used forfiltration of other liquids, as well.

The liquid filter assembly 10 includes a housing arrangement 12. Thehousing arrangement 12 includes a housing 14. The housing 14 can includea surrounding wall 16. The surrounding wall 16 defines within it ahousing interior 18.

The housing arrangement 12 includes an inlet 20. The inlet 20 can be forconveying unfiltered fluid, such as unfiltered liquid, such asunfiltered oil.

The housing arrangement 12 can include an outlet 22. The outlet 22 willbe for conveying fluid that has entered into the inlet 20. Typically,the fluid conveyed through the outlet 22 will be filtered liquid. Insome systems, including in-tank systems 5 (discussed below), the housingsurrounding wall 14 can just be open at the bottom 15, to provide theoutlet 22 (see FIG. 9).

In some assemblies 10, the housing arrangement 12 can have a closedbottom (not shown).

One general type of filtration system shown in FIGS. 9-11 is sometimesreferenced as in-tank system 5. In-tank filter systems are described,for example, in PCT publication WO 2005/063358, published Jul. 14, 2005;and, in PCT publication WO 2008/030323, published Mar. 13, 2008. Each ofthese two PCT publications is incorporated herein by reference.

In general terms, the in-tank filter system 5, is a system configured tobe mounted on a reservoir tank 190 for the liquid involved. The system 5will typically provide for at least one of: liquid flow to the tank; ordraw liquid from the tank. Typically, in-tank filter assembly 5 includeshousing arrangement 12 having a removable, i.e. serviceable, filterelement 40 appropriately positioned therein. The filter element 40 isperiodically removed for servicing, for example when it becomessufficiently occluded to generate an undesirable level of restrictionacross the filter media, or when a service interval is passed. Servicingtypically involves one of: replacing with a new filter element 40;replacing with a previously used, but refurbished, filter element 40;or, in some manner cleaning the removed element 40 and replacing it forfurther use.

The filter assemblies 10 described herein are preferably part of in-tankfilter systems 5. In some implementations, they may be part of alternatearrangements.

The housing arrangement 12 can also include a removable cover 24. Thecover 24 can be secured to the housing 14 by way of suitable fasteners26. In this way, the cover 24 can be selectively removed from thehousing 14. Removing the cover 24 from the housing 14 will allow accessto the housing interior 18.

When the housing arrangement 12 is part of the in-tank filter system 5,the cover 24 can be on the exterior of the tank 190.

Independent of the above, the liquid filter assembly 10 includes asupport member 28. The support member 28 is operably oriented in thehousing interior 18.

The support member 28 can be rigid. By rigid, it is meant that thesupport member 28 is not generally flexible and will not change shape inresponse to normal amounts of compressive force occurring duringhandling. Alternatively, the support member 28 can be a thin (2 mm orless in thickness) screen that, while being generally compressible,resists expansion forces.

The support member 28 can be porous. The porous nature of the supportmember 28 allows liquid to flow through it.

The support member 28 can be tubular in shape. It can have a surroundingwall 30 defining an interior volume 32 within the support member wall30.

The support member 28 can have a closed bottom end 34. In otherembodiments, the support member 28 could have an open bottom end.

The support member 28 can be cylindrical in shape, in some embodiments.

Independent of the above, the liquid filter assembly 10 can includefilter element 40. The filter element 40 can be arranged relative to thehousing arrangement 12 to receive unfiltered liquid from the housinginlet 20, to filter the liquid, and then allow the filtered liquid toexit the housing arrangement 12 through the outlet 22.

The filter element 40 can be removably and replaceably oriented in thehousing interior 18.

Independent of the above, the filter element 40 can be removably andreplaceably oriented in the interior volume 32 of the support member 28.In FIGS. 2 and 6, the filter element 40 can be seen as it is beingassembled within the interior volume 32 of the support member 28.

Together, the support member 28 and filter element 40 may form a moduleassembly 36 (FIGS. 11-13).

The module assembly 36 can be used inside of tank 190, in which theseparation room is built in the inside of the tank 190. Alternatively,the module assembly 36 can be used to complete a filter assembly to betop tank mounted.

Independent of the above, the filter element 40 can include a media pack42. The media pack 42 will include filter media 44. When liquid passesthrough the filter media 44, the filter media 44 will remove debris andparticulate from the liquid.

The media pack 42 can be a tubular media pack 46. The tubular media pack46 defines a media interior 48 within the tubular media pack 46.

In some embodiments, the media interior 48 can be an upstream side,containing an unfiltered liquid volume 50.

Independent of the above, the media pack 42 can be secured to a firstend cap 52. The first end cap 52 can be an open end cap or a closed endcap. In the examples shown in the FIGS., the first end cap 52 is aclosed end cap 54.

The first end cap 52 can be adjacent to the bottom end 34 of the supportmember 28. In the embodiment shown, the first end cap 52 can be adjacentand against the closed bottom end 34.

Independent of the above, the media pack 42 can be secured to a secondend cap 56. The second end cap 56 can be at an end of the element 40opposite from the first end cap 52.

The second end cap 56 can be an open end cap 58.

The open end cap 58 defines an opening 60, which allows for access tothe media interior 48.

Independent of the above, the filter element 40 includes a seal member62. The seal member 62 can be useful in forming a seal with anothercomponent in the liquid filter assembly to prevent unfiltered liquidfrom bypassing the media pack 42.

In example embodiments, the filter element seal member 62 can be in theform of an O-ring seal member 64. Alternate seals such as lip seals,bulb seals, or flat gaskets may also be used.

The seal member 62 can be held by the open end cap 58. When the sealmember 62 is O-ring seal member 64, the open end cap 58 can include aradial groove 66.

In some examples, the radial groove 66 can be outwardly directed. TheO-ring seal member 64 can be held by the radial groove 66 to form a sealwith another component within the liquid filter assembly 10. The sealcan be a radial seal. In some configurations, the seal is partially orwholly positioned to form an axial seal

Independent of the above, the media pack 42 can comprise pleated media.For example, the media pack 42 can comprise a pleated cellulose media.In some configurations, the media is non-pleated.

Independent of the above, the media pack 42 can extend an entire lengthbetween the closed end cap 54 and open end cap 52.

In the embodiment of FIGS. 5-8, the filter element seal member 62 formsa seal 68 against the support member 28.

In example embodiments, the seal 68 is formed by the seal member 62between and against the radial groove 66 and an inside surface 70 (FIG.7) of the support member wall 30.

Independent of the above, in some example assemblies 10, the filterelement 40 is arranged for inside to outside flow. That is, in somearrangements, the filter element 40 is arranged relative to the housingarrangement 12 to receive unfiltered liquid from the housing inlet 20,into the media interior 48, where it is part of the unfiltered liquidvolume 50. From the unfiltered liquid volume 50, the liquid flowsthrough the media pack 42 and then through the support member 28, whereit becomes part of a filtered liquid volume 72. The filtered liquidvolume 72 is the volume within the housing interior 18 and outside ofthe interior volume 32 of the support member 28. From the filteredliquid volume 72, the liquid then flows through the housing outlet 22.

To account for instances when restriction across the media pack 42reaches a predetermined level, the filter assembly 10 has a bypass valvearrangement 74. The bypass valve arrangement 74 will permit at leastsome unfiltered liquid to bypass the media pack 42 and flow into thefiltered liquid volume 72 outside of the support member 28.

The module assembly 36 can include, as part of it, the bypass valvearrangement. Thus, in some example implementations, the module assembly36 can include the support member 36, filter element 40, and bypassvalve arrangement 74.

Independent of the above, the bypass valve arrangement 74 can include abias member seat 80.

The biasing member 82 will be operably held by the bypass member seat80.

In example embodiments, the biasing member 82 can be in the form of aspring 84.

In the embodiment of FIGS. 1-4, the bias member seat 80 can be attachedto the support member 28.

In reference to the examples shown in FIGS. 1-4, the bias member seat 80can be embodied as a tube 86. The tube 86 can surround and be radiallyspaced from at least a portion of the filter element 40. The tube 86 istypically circular or oval in cross-section, but other shapes arepossible.

In FIG. 3, in this example embodiment, the tube 86 includes an open end88 and an opposite attachment end 90.

The attachment end 90 can include a radially inwardly extending rim 92.The support member 28 has an outwardly extending rim 94, which may begenerally perpendicular to the support member wall 30. The supportmember rim 94 overlaps an inside surface of the tube rim 92.

Independent of the above, between the support member 28 and the tube 86,there can be a seal member 96. In the example shown in FIG. 3, the sealmember 96 is between the support member rim 94 and the tube rim 92. Thisseal member 96 forms a seal between the tube 86 and the support member28. In some embodiments, the tube 86 is an integral part of the supportmember 28 or is permanently secured thereto, by welding or adhesive, forexample, and no seal member 96 is necessary.

In the embodiment of FIGS. 5-8, the bias member seat 80 is attached tothe housing arrangement 12.

Independent of the above, in the embodiment of FIGS. 5-8, the biasmember seat 80 includes an outer tube 98. The outer tube 98 surroundsand is radially spaced from at least a portion of a valve head 126, tobe discussed further below.

Still in reference to FIG. 7, the bias member seat 80 includes an innertube 100. The inner tube 100 is radially spaced from at least a portionof the outer tube 98 to hold the biasing member 82 in between.

Independent of the above, in the example embodiment shown in FIG. 7, theouter tube 98 includes a straight wall section 102 having a free end104. At a portion of the outer tube 98 opposite of the free end 104,there is a radially outward projection 106. The radially outwardprojection 106 engages an inwardly extending shelf 108 of the housingsurrounding wall 16.

Still in reference to FIG. 7, along the straight wall section 102 andadjacent to the projection 106 is a seal member seat 110. The sealmember seat 110 holds a seal member 112. The seal member 112 forms aseal with an inside surface 114 of the housing surrounding wall 16.

Independent of the above, and still in reference to FIG. 7, adjacent tothe radial projection 106 is an axial projection 116. Axial projection116, in the example embodiment shown, forms an end that is opposite fromthe free end 104.

Still in reference to FIG. 7, and independent of the above, the innertube 100 can include a tube fastening section 118. The tube fasteningsection 118 is fastened or secured to the outer tube 98.

In the illustrated example of FIG. 7, the tube fastening section 118 issecured to the axial projection 116 of the outer tube 98.

Independent of the above, the inner tube 100 includes an inner tubesection 120 that is radially inward of the tube fastening section 118.The inner tube section 120 is radially spaced from the straight wallsection 102 of the outer tube 98.

Still in reference to FIGS. 7 and 8, and independent of the above, theinner tube section 120 has a sealing surface 122 along an outside of thesection 120. The sealing surface 122 provides a surface for forming aseal, as discussed further below. In some embodiments, the sealingsurface 122 is on the inside of section 120.

Independent of the above, the bypass valve arrangement 74 includes avalve head 126.

The valve head 126 can be positioned within the bias member seat 80.

Independent of the above, the valve head 126 can be engaged against thebiasing member 82.

Independent of the above, the bypass valve arrangement 74 can include avalve seat 128. The valve seat 128 is in removable sealing engagementwith the valve head 126.

In example embodiments, when the valve head 126 is moved out of sealingengagement with the valve seat 128, a bypass opening 130 (FIGS. 4 and 8)allows flow of unfiltered liquid into the filtered liquid volume 72.When the valve head 126 is in sealing engagement with the valve seat128, the bypass opening 130 is closed, preventing unfiltered liquid frombypassing the media pack 42.

In reference now to the embodiment of FIGS. 1-4, and specifically toFIG. 3, the valve head 126 can include a sealing surface 132. The filterelement seal member 62 is sealed against the sealing surface 132.

Independent of the above, in FIGS. 4 and 8, the valve head 126 may beembodied as a ring 134 having a step 136 to form a stepped ring 138.

In some example embodiments, when the valve head 126 includes steppedring 138, the stepped ring 138 can have an axial end 140 (FIGS. 3, 4, 78). The axial end 140 can be in sealing engagement with the valve head126.

Independent of the above, and in reference to FIGS. 3, 4, 7, 8, therecan be a bypass valve seal member 142 operably held by the valve seat128. The axial end 140 of the valve head 126 can be in sealingengagement against the bypass seal member 142 when the bypass opening130 is closed. The axial end 140 can be spaced away from the bypass sealmember 142 when the bypass opening 130 is opened.

Independent of the above, the biasing member 82 can be engaged againstthe step 136 in the ring 134. The biasing member 82 will provide a forceagainst the step 136 to resist fluid pressure within the unfilteredliquid volume 50. When the pressure within the unfiltered liquid volume50 becomes sufficiently large to create a force on the step 136 toovercome the force of the biasing member 82, the fluid pressure willpush against the step 136 and move the valve head 126 against thebiasing member 82. This will move the axial end 140 of the ring 134 awayfrom sealing engagement with the bypass valve seal member 142. This willopen the bypass opening 130 (see FIGS. 4 and 8).

In the embodiment of FIGS. 1-4, and specifically referring to FIGS. 3and 4, as the valve head 126 is moved away from the valve seat 128, thefilter element seal member 62 moves along and slides against the sealingsurface 132 of the valve head 126.

The seal member 62 forms seal 68 with the sealing surface 132 of thevalve head 126.

Independent of the above, a dynamic seal is engaged as the valve head126 moves into and out of sealing engagement. In one or more exampleembodiments, the seal member 62 is configured to form seal 68 to be adynamic seal. The dynamic seal 68 is configured to repeatedly changeposition, as it slides along and against sealing surface 132.

The seal member 62, in examples embodied as O-ring 64, can be configuredto form seal 68 to be dynamic seal, which is configured to repeatedlychange position, as it slides along and against sealing surface 132.

Independent of the above, and still in reference to the embodiment ofFIGS. 1-4, it can be seen how the tube 86 of the bias member seat 80 isradially spaced from a portion of the valve head 126 (FIG. 3). The biasmember 82 is located between the inner surface of the tube 86 and anouter surface of the ring 134, with the biasing member 82 engagedagainst the step 136 of the ring 134.

Still in reference to FIGS. 1-4, and independent of the above, the ring134 has a second axial end 144 (FIG. 3), opposite of the axial end 140.The support member rim 94, where it is engaged with the tube rim 92,will form a stop surface for the second axial end 144 to engage, toprevent the valve head 126 from moving beyond that point.

Independent of the above, and in reference now to the embodiment ofFIGS. 5-8, in particular FIGS. 7 and 8, the stepped ring 138 has aninside surface 146. The inside surface 146 is in sealing engagement withthe inner tube 100 of the bias member seat 80.

In the examples shown in FIGS. 7 and 8, the inside surface 146 of thestepped ring 138 is in sealing engagement with the sealing surface 122of the inner tube section 120.

Independent of the above, and still in reference to FIGS. 7 and 8, thestepped ring 138 can include a seal ring groove 148 at or adjacent to aportion that is on an opposite end as the axial end 140 of the ring 134.The seal ring groove 148 can hold a seal member, such as an O-ring sealmember 150. The seal member 150 can form a seal with the sealing surface122 of the inner tube 100 of the bias member seat 80.

Still in reference to FIGS. 7 and 8, and independent of the above, thebiasing member 82 is held in the bias member seat 80 between thestraight wall section 102 of the outer tube 98 and the valve head 126.

In the examples shown in FIG. 7, the biasing member 82 is between thestraight wall section 102 of the outer tube 98 and the ring 134. Thebiasing member 82 is engaged against the step 136 and is held betweenthe step 136 and a shoulder 152 that can be part of the inner tube 100.The shoulder 152 can extend between the tube fastening section 118 andthe inner tube section 120.

Independent of the above, and in reference to the embodiment of FIGS. 7and 8, the biasing member 82 will cause a force on the step 136 andagainst a force on an opposite side of the step 136 from fluid pressurein the unfiltered liquid volume 50. When the pressure in the unfilteredliquid volume 50 increases due to, for example, increased restrictionacross the media pack 42, the force against the step 136 will overcomethe force of the biasing member 82. This will move the valve head 126 sothat the seal member 150 slides along and against the inner tube 100 ofthe bias member seat 80. As the valve head 126 moves in an axialdirection, the axial end 140 of the ring 134 is moved away from thebypass valve seal member 142, which opens the bypass opening 130 (FIG.8).

Independent of the above, a dynamic seal is engaged as the valve head126 moves into and out of sealing engagement. In one or more exampleembodiments, the seal member 150 is configured to form the dynamic seal,configured to repeatedly change position, as it slides along and againstthe inner tube 100 of the bias member seat 80.

The seal member 150, in examples embodied as an O-ring seal member, canbe configured to form the dynamic seal, which is configured torepeatedly change position, as it slides along and against the innertube 100 of the bias member seat 80. For example, the sealing engagementbetween the inside surface of the stepped ring 134 and the inner tube100 of the bias member seat 80 is a dynamic sealing engagement.

Independent of the above, and in reference now to the embodiment ofFIGS. 1-4, the valve seat 128 can be secured to the housing arrangement12.

In a non-limiting example in FIG. 3, the valve seat 128 can include aradial projection 156. The radial projection 156 engages against theinwardly extending shelf 108 of the housing surrounding wall 16. Thisengagement can help to hold the valve seat 126 in place relative to thehousing arrangement 12. Other embodiments are possible.

Independent of the above, and still in reference to FIG. 3, the valveseat 128 can include a seal member holding section 158. The seal memberholding section 158 can include a groove 160 for holding a seal member162. The seal member 162 forms a seal 163 (FIG. 4) against the insidesurface 114 of the housing surrounding wall 16.

Independent of the above, in the examples shown in FIG. 4, the seal 163between the seal member 162 and the housing surrounding wall 16 isformed along the radially inwardly extending section of 164 of the shelf108.

Independent of the above, and still in reference to FIG. 3, adjacent tothe radial projection 156 can be an axial projection 166 in the valveseat 128. The axial projection 166 can also form one end of the valveseat 128 opposite from an end forming the seal member holding section158.

Independent of the above, and still in reference to FIG. 3, the valveseat 128 can include a seal member seat 168. The seal member seat 168can hold the bypass valve seal member 142. In the examples shown inFIGS. 3 and 4, the seal member seat 168 is adjacent to the seal memberholding section 158.

In the examples shown in FIG. 3, the seal member seat 168 is on anopposite side of the seal member holding section 158 from the sealmember 162.

Independent of the above, and in the non-limiting examples shown in FIG.3, the valve seat 128 can include an inner ring 170. The inner ring 170is spaced radially from the seal member holding section 158, to definethe seal member seat 168 therebetween.

In the example shown in FIG. 3, the bypass valve seal member 142 is heldin the seal member seat 168 between the inner ring 170 and the sealmember holding section 158.

Independent of the above, and in reference to the embodiment of FIG. 3,the inner ring 170 can be secured to the remaining portion of the valveseat 128 by securing the ring 170 to the axial projection 166. There canbe many variations.

In reference now to the embodiment of FIGS. 7 and 8, and independent ofthe above, the valve seat 128 in this embodiment can be secured to thesupport member 28.

Independent of the above, in the embodiment of FIGS. 7 and 8, the valveseat 128 can include a band 172.

In the non-limiting examples shown in FIGS. 7 and 8, the band 172surrounds at least a portion of the support member 28.

Independent of the above, and still in reference to FIG. 7, the band 172can include an axially extending wall 174. Extending inwardly from thewall 174 is an inwardly projecting rim 176.

Independent of the above, and in the example embodiments shown in FIG.7, the wall 174 and rim 176 form a shoulder 178. The shoulder 178 can beused to hold the bypass valve seal member 142.

Independent of the above, and in reference to FIG. 7, the support memberrim 94 can overlap the rim 176. A seal member 180 can be between thesupport member rim 94 and the rim 176 to form a seal therebetween.

Independent of the above, the liquid filter assembly 10 can include anoptional magnet holder 200 (FIG. 14). The magnet holder 200 is shownused with the assembly of FIGS. 1-4, and it should be understood that itis also optionally usable with the assembly of FIG. 5-8.

The magnet holder 200 may be constructed to be oriented in theunfiltered liquid volume 50 (FIG. 1), such that liquid entering theassembly 10 from the inlet 20 flows through the magnet holder 200. Themagnet holder 200 can hold a magnet arrangement 202, which will attractmetal particles from the incoming liquid.

The magnet holder 200 can include an outer ring 204, which can rest onthe shoulder 152. Gussets 206 can join the outer ring 204 to a main body208 of the magnet holder 200. The main body 208 can be used to hold themagnet arrangement 202.

Independent of the above, the liquid filter assembly 10 can include anoptional bypass screen 210. The bypass screen 210 is shown used with theassembly of FIGS. 1-4, and it should be understood that it is alsooptionally usable with the assembly of FIG. 5-8. The screen 210 is shownused with the magnet holder 200, but it should be understood that it canbe used without the magnet holder 200.

The bypass screen 210 will act as a coarse filter 212 to remove at leastsome debris larger than the screen size, in situations when the bypassopening 130 is opened (FIGS. 4 and 8). Any bypass flow will flow throughthe bypass screen 210 before reaching the filtered liquid volume 72(FIG. 1).

In the example shown in FIG. 14, the bypass screen 210 includes a radialextending ring 214. The ring 214 is positionable on the shoulder 152.

In some embodiments which use both the magnet holder 200 and the bypassscreen 210, the ring 214 can be between and against the shoulder 152 andthe outer ring 204 of the magnet holder 200.

Independent of the above, and in reference now to FIGS. 15 and 16, thesupport member 28 can include a bulge 218 along the closed bottom end34.

The bulge 218 can help strengthen the support member 28. Without thebulge 218, the support member wall 30 may need to be thicker than inarrangements that have the bulge 218.

The bulge 218 can be helpful in identifying the correct filter element40 for assembly in the support member 28. A correct filter element 40for the support member 28 can include an end cap bulge 220 as part ofthe closed end cap 54. The end cap bulge 220 can fit within and againstan internal surface of the support member bulge 218.

FIG. 16 shows pressure in the form of arrows 222 that will be againstthe end cap 54. The end cap bulge 220 can be helpful in strengtheningthe filter element 40 with respect to the pressure 222.

Further examples of bulges that can be used as part of the supportmember 28 and end cap 54 are shown in FIGS. 23 and 25-27.

FIG. 23 illustrates liquid filter assembly 10. The filter assembly 10includes filter element 40 having a bulged closed end cap 402. Theassembly 10 in FIG. 23 is analogous to the arrangement of FIGS. 1-4. Itshould be understood, however, that the element 40 having the bulgedclosed end cap 402 could also be part of the assembly of FIGS. 5-8.

In FIG. 23, the filter element 40 includes tubular media pack 46defining media interior 48. The media pack 46 has an opposite first end404 (FIG. 25) and second end 406. The open end cap 58 (FIG. 25) issecured to the media pack 46 at or near the first end 404.

The bulged closed end cap 402 is secured to the media pack 46 at or nearthe second end 406.

Referring now to FIG. 25, the bulged closed end cap 402 includes anexterior portion 408. The exterior portion 408 faces away from aremaining portion of the filter element 40. The exterior portion 408 isnot in communication with the media interior 48.

On a portion opposite of the exterior portion 408, the closed end cap402 has an interior portion 410. The interior portion 410 is incommunication with the media interior 48.

The exterior portion 408 defines a bulge 412. The bulge 412 extends awayfrom a remaining portion of the filter element 40. The bulge 412 extendsbeyond the second end 406 of the media pack 46.

While the bulge 412 is illustrated as extending away from a remainingportion of the filter element 40 to be an outward bulge, it should beunderstood that the bulge could also extend inwardly and be directedinto the media interior 48.

The interior portion 410 of the closed end cap 402, in this embodiment,defines a concave receptacle 414. The concave receptacle 414 providesadvantages. When the filter element 40 is operated as an “in-to-out”flow filter, in which unfiltered liquid flows first into the mediainterior 48 and then flows radially outwardly through the media pack 46,the receptacle 414 can act as a receptacle to receive particulate thatcannot pass through the media 40. Because the receptacle 414 is beyondthe media 40, and in the embodiment shown in FIG. 25, it is below thesecond end 406 of the media 46, any particulate matter that is in thereceptacle 414 will not block or mask the media 46.

The interior portion 410 of the closed end cap 402 can include structureto strengthen the bulge 412, while still be shaped to form thereceptacle 414 for receiving particles. In the example shown in FIGS. 25and 26, the interior portion 410 of the closed end cap 402 includes aplurality of spaced ribs 416. In this example, the ribs 416 extendradially from a center 418 of the closed end cap 402 to a rim 420. Inthis non-limiting example, the rim 420 is circumscribed by the innermedia pack 46.

In this non-limiting example, the interior portion 410 of the closed endcap 402 may include a plurality of gussets 422. The gussets 422 canextend circumferentially on the interior portion 410. In the exampleshown, the gussets 422 extend between the ribs 416. Many variations arepossible.

As with the embodiment of FIG. 1, the filter element 40 can be removedand replaced in the assembly 10, including removing it from the supportmember 28. FIG. 27 illustrates a perspective, cross-sectional view of abottom region of the support tube 28 utilized in the assembly of FIG.23. The support member 28 has bulge 218 along the closed bottom end 34(FIG. 1). As mentioned above, the bulge 218 helps to strengthen thesupport member 28. It further helps to support and strengthen the bulgedclosed end cap 402, such that the receptacle 414 can be used for thecollection of particulate or debris.

In reference again to FIG. 23, the filter assembly 10 has biasing member82. In this particular embodiment, the biasing member 82 comprises awave spring 430 (FIGS. 23 and 24). The wave spring 430 can be usedinstead of the coiled spring 84, described above. The wave spring 430can provide increased accuracy of spring force, as compared to a wirespring. Furthermore, the wave spring 430 can provide an increasedstiffness for a given area, as compared to a wire spring.

It should be understood that the wave spring 430 is shown used with theassembly 10 of FIG. 23, but the wave spring 430 can be used in any ofthe previously described embodiments as the biasing member 82.

From the above examples, operation of the liquid filter assembly 10should be apparent. Unfiltered liquid will be directed into the housinginlet 20 and into the media interior 48. There, it will be part of theunfiltered liquid volume 50.

The method can include filtering the unfiltered liquid by directing theliquid to flow through the media pack 42 and then through the supportmember 28 to the filtered liquid volume 72. The filtered liquid volume72 will be outside of the interior volume 32 of the support member 28.From the filtered liquid volume 72, the liquid will be directed throughthe housing outlet 22.

Independent of the above, when restriction across the media pack 42reaches a predetermined level, the method can include opening the bypassvalve arrangement 74 to permit at least some unfiltered liquid to bypassthe media pack 42 and flow into the filtered liquid volume 72 outside ofthe support member 28.

In the method, and independent of the above, the bypass valvearrangement 74 can include bias member seat 80, biasing member 82operably held by the bias member seat 80, valve head 126 within the biasmember seat 80 and engaged against the biasing member 82, and valve seat128. The valve seat 128 will be in removable sealing engagement with thevalve head 126, such that when restriction across the media pack 42reaches a predetermined level, the valve head 126 is moved out ofsealing engagement with the valve seat 128, opening the bypass opening130 to allow flow of unfiltered liquid into the filtered liquid volume72.

Independent of the above, in the method, the bias member seat 80 can beattached to the support member 28.

Independent of the above, the bias member seat 80 can be attached to thehousing arrangement 12.

Independent of the above, the valve head 126 can include sealing surface132. The filter element seal member 62 can be sealed against the sealingsurface 132.

Independent of the above, the method can include the valve seat 128being secured to the support member 28.

Independent of the above, the valve seat 128 can be secured to thehousing arrangement 12.

Independent of the above, the method can include the filter element 40having seal member 62 forming seal 68 against the support member 28.

FIGS. 17-22 illustrate another embodiment. A filter assembly 300 isdepicted in partial cross-section in FIG. 17. The filter assembly 300may be used in a variety of implementations. In one non-limitingexample, the filter assembly 300 can be used in a return line of ahydraulic fluid system.

The filter assembly 300 includes a filter cartridge 302. The filtercartridge 302 can include filter media 304. One example type of filtermedia 304 usable is pleated media 306 forming a tube 308 (FIGS. 21 and22). The tube 308 can be oval or round in cross-section. In the exampleshown in FIG. 22, it is round in cross-section.

The filter cartridge 302 is received within an outer liner 310. Theouter liner 310 can be reusable. By reusable, it is meant that when thefilter cartridge 302 is replaced, the outer liner 310 is not replacedbut is again used with the replacement filter cartridge 302.

Many different materials can be used for the outer liner 310. In anon-limiting example, the outer liner 310 is made from metal.

The filter cartridge 302 and liner 310 can be secured together. In anon-limiting example shown, the filter cartridge 302 and liner 310 aresecured together with endpiece 312.

The endpiece 312 can be many types of constructions. In the non-limitingexample shown, the endpiece 312 is an open spider casting 314 at a firstend 316 of the filter cartridge 302. The open spider casting 314 allowsunfiltered fluid to flow into an inner volume 317 of the tube 308 offilter media 304.

In the non-limiting example shown, a second end 318 of the cartridge 302and opposite of first end 316 is a closed end casting 320. The closedend casting 320 prevents the passage of fluid through the second end 318of the cartridge 302.

The first end 316 of the filter cartridge 302 includes the filter media304 sealed or otherwise secured to a first end cap 321. The media 304can be potted within the first end cap 321 with urethane or othersuitable material. The first end cap 321 can be a variety of materialsincluding metal or non-metal. In the non-limiting example shown, thefirst end cap 321 is metal.

The second end 318 of the filter cartridge 302 includes the filter media304 sealed or otherwise secured to a second end cap 322. The media 304can be potted within the second end cap 322 with urethane or othersuitable material. The second end cap 322 can be a variety of materialsincluding metal or non-metal. In the non-limiting example shown, thesecond end cap 322 is metal.

When assembled, the filter cartridge first end cap 321 seals against agrommet 324, which is secured to an end piece 326 attached to the outerliner 310. See FIG. 18.

In the non-limiting example shown, the end piece 326 has a generallyU-shaped cross-section with a main section 328 and a pair of arms 330,332 extending therefrom. The main section 328 can be generally parallelto the first end cap 321. The arm 330 extends next to, along a samedirection as (generally parallel to), and radially outside of the outerliner 310. The arm 332 can be generally parallel to the outer liner 310and arm 330, while being radially inward of and radially spaced from thecartridge 302 including the first end cap 321.

In the non-limiting example shown, the grommet 324 has a radial grommetsection 325 oriented to be between and against a radially outwardlyfacing surface 334 of the arm 332 and an radially inner facing surface336 of the first end cap 321.

In the non-limiting example shown, the grommet 324 has an axial grommetsection 327 oriented between and against the main section 328 of the endpiece 326 and an axial portion 338 of the first end cap 321.

Between an outer axial surface 340 of the main section 328 of the endpiece 326 and an inner axial surface 342 of a rim 344 of the open spidercasting 314 can be a flat gasket 346.

In the non-limiting example shown, the second end 318 of the cartridge302 seals against a metal end cap 350 provided on the closed end casting320. A grommet 352 has a radial section 353 oriented between and againstan inwardly radial surface 354 of the second end cap 322 and anoutwardly radial surface 356 of the end cap 350.

In the non-limiting example shown, the grommet 352 has an axial section355 oriented between and against an outward axial surface 358 of thesecond end cap 322 and an inward axial surface 360 of the end cap 350.

In the example shown, the end cap 350 on the closed end casting 320includes an inwardly protruding section 362, protruding into the innervolume 317 of the tube 308 of filter media 304.

A post 364 is provided that extends through the filter cartridge 302 andcastings 314, 320 wherein nuts and springs 366, 368 are used at each endof the post 364 to result in a fully assembled filter assembly. In someoptional examples, the post 364 can hold a magnet 370 in the innervolume 317.

In operation, fluid flows into the inner volume 317 of the filtercartridge 302 via the open spider casting 314, is filtered by flowingthrough the media 304, and then exits the filter cartridge 302.

The above description represents example principles of this disclosure.Many embodiments can be made applying these principles.

What is claimed is:
 1. A liquid filter assembly comprising: (a) ahousing arrangement including a surrounding wall defining a housinginterior, an inlet, and an outlet; (b) a porous tubular support memberin the housing interior; the support member having an interior volume;(c) a filter element in the interior volume of the support member; thefilter element having a longitudinal axis and including a tubular mediapack defining a media interior; the media pack being secured to a closedend cap and an open end cap; (i) the filter element being arrangedrelative to the housing arrangement to receive unfiltered liquid fromthe housing inlet, through the open end cap into the media interior andthen allow the unfiltered liquid to flow through the media pack and thenthrough the support member to a filtered liquid volume outside of theinterior volume of the support member, and then through the housingoutlet; (d) a bypass valve arrangement to permit at least someunfiltered liquid to bypass the media pack and flow into the filteredliquid volume; the bypass valve arrangement including a valve head and avalve seat; (i) when the valve head is moved out of sealing engagementwith the valve seat, a bypass opening allows flow of unfiltered liquidinto the filtered liquid volume, (ii) when the valve head is in sealingengagement with the valve seat, the bypass opening is closed, preventingunfiltered liquid from bypassing the media pack; and (e) a dynamic sealincluding a moving seal seat of the bypass valve arrangement and anannular seal member held by the open end cap on a radially outerperiphery thereof, the seal member constantly engaging the moving sealseat as the valve head moves into and out of sealing engagement with thevalve seat.
 2. A liquid filter assembly according to claim 1 wherein:(a) the bypass valve arrangement includes: (i) a bias member seatattached to the support member; (ii) a biasing member operably held bythe bias member seat; (iii) the valve head being within the bias memberseat and engaged against the biasing member; and (iv) the valve seatbeing secured to the housing arrangement and being in removable sealingengagement with the valve head.
 3. A liquid filter assembly according toclaim 2 wherein: (a) the bias member seat comprises an outer tube and aninner tube; the outer tube surrounding and being radially spaced from atleast a portion of the valve head.
 4. A liquid filter assembly accordingto claim 3 wherein: (a) the biasing member is oriented between an insideof the outer tube of the bias member seat and an outside of the valvehead.
 5. A liquid filter assembly according to claim 3 wherein: (a) thevalve head comprises a stepped ring; an inside surface of the steppedring forming the moving seal seat of the dynamic seal and an outersurface of the stepped ring engaging against the biasing member.
 6. Aliquid filter assembly according claim 1 wherein: (a) the seal membercomprises an o-ring seal member dynamically sealed against a sealingsurface of the valve head.
 7. A liquid filter assembly according toclaim 1 wherein: (a) the moving seal seat is formed as part of the valvehead.
 8. A liquid filter assembly according to claim 1 wherein: thefilter element is removably and replaceably oriented in the interiorvolume of the support member.
 9. A method of filtering comprising: (a)using a housing arrangement including a wall defining a housinginterior, an inlet, and an outlet; a support member in the housinginterior; the support member having an interior volume; a filter elementoriented in the interior volume of the support member; the filterelement including a media pack defining a media interior; the filterelement including a seal member; (b) directing unfiltered liquid to flowinto the housing inlet, and into the media interior; (c) filtering theunfiltered liquid by directing the liquid to flow through the media packand then through the support member to a filtered liquid volume outsideof the interior volume of the support member, and then through thehousing outlet; and (d) when restriction across the media pack reaches apredetermined level, opening a bypass valve arrangement to permit atleast some unfiltered liquid to bypass the media pack and flow into thefiltered liquid volume; the bypass valve arrangement including: (i) abias member seat attached to the support member; (ii) a biasing memberoperably held by the bias member seat; (iii) a valve head within thebias member seat and engaged against the biasing member; (A) the valvehead having a sealing surface; the filter element seal member beingsealed against the sealing surface; and (iv) a valve seat secured to thehousing arrangement and being in removable sealing engagement with thevalve head, such that when restriction across the media pack reaches apredetermined level, the valve head is moved out of sealing engagementwith the valve seat, opening a bypass opening to allow flow ofunfiltered liquid into the filtered liquid volume.